Experimental Investigations of Wooden Beam Ends in Masonry with Interior Insulation: Measured Data in Real-Scale Experimental Walls Exposed to Semi-Continental Climatic Conditions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00332826" target="_blank" >RIV/68407700:21110/19:00332826 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21720/19:00332826

Výsledek na webu

<a href="https://doi.org/10.1177/1744259119867461" target="_blank" >https://doi.org/10.1177/1744259119867461</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1177/1744259119867461" target="_blank" >10.1177/1744259119867461</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental Investigations of Wooden Beam Ends in Masonry with Interior Insulation: Measured Data in Real-Scale Experimental Walls Exposed to Semi-Continental Climatic Conditions

Popis výsledku v původním jazyce

This article deals with the hygrothermal performance of wooden beam ends embedded in brick masonry walls. The real-scale experiment involving three interior insulation systems with different water vapor resistances and different treatments of joist pockets was monitored for three consecutive years. The moisture load of test walls was controlled during the experiment. First, humidity of indoor air was increased in the cold season (2016–2017). Then, an artificial short-time intensive rain event brought liquid water onto the external surface of the test walls in July 2017. Despite relatively mild external climatic loads, relative humidity was unsatisfactorily high in unsealed joist pockets. Vapor and airtight sealing of the joist pockets improved the microclimate of the wooden beam ends. However, even in this case, relative humidity approached critical values for the onset of mold growth. The artificial rain load applied on the experimental walls noticeably worsened the hygrothermal conditions in the joist pockets. Relative humidity in the joist pockets further increased to a level where massive mold growth could be expected. Visual inspection of the wooden beam ends during reconstruction of the experiment, however, revealed only a small spot of mold on a single beam located in an unsealed joist pocket. Mold growth on samples of organic thermal insulation material was found by microscopic investigations. Molds were localized in small separated colonies. These in situ and laboratory investigations do not confirm the calculated values of mold growth index. In conclusion, sealing of wooden beam ends improved their hygrothermal performance in the experiment.

Název v anglickém jazyce

Experimental Investigations of Wooden Beam Ends in Masonry with Interior Insulation: Measured Data in Real-Scale Experimental Walls Exposed to Semi-Continental Climatic Conditions

Popis výsledku anglicky

This article deals with the hygrothermal performance of wooden beam ends embedded in brick masonry walls. The real-scale experiment involving three interior insulation systems with different water vapor resistances and different treatments of joist pockets was monitored for three consecutive years. The moisture load of test walls was controlled during the experiment. First, humidity of indoor air was increased in the cold season (2016–2017). Then, an artificial short-time intensive rain event brought liquid water onto the external surface of the test walls in July 2017. Despite relatively mild external climatic loads, relative humidity was unsatisfactorily high in unsealed joist pockets. Vapor and airtight sealing of the joist pockets improved the microclimate of the wooden beam ends. However, even in this case, relative humidity approached critical values for the onset of mold growth. The artificial rain load applied on the experimental walls noticeably worsened the hygrothermal conditions in the joist pockets. Relative humidity in the joist pockets further increased to a level where massive mold growth could be expected. Visual inspection of the wooden beam ends during reconstruction of the experiment, however, revealed only a small spot of mold on a single beam located in an unsealed joist pocket. Mold growth on samples of organic thermal insulation material was found by microscopic investigations. Molds were localized in small separated colonies. These in situ and laboratory investigations do not confirm the calculated values of mold growth index. In conclusion, sealing of wooden beam ends improved their hygrothermal performance in the experiment.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/LO1605" target="_blank" >LO1605: Univerzitní centrum energeticky efektivních budov – Fáze udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Building Physics

ISSN

1744-2591

e-ISSN

1744-2583

Svazek periodika

43

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

24

Strana od-do

147-170

Kód UT WoS článku

000483190900001

EID výsledku v databázi Scopus

2-s2.0-85071470743